X11-75dpi-fonts contains the 75 dpi fonts used
on most X Window Systems. If you're going to use the
X Window System, you should install this package, unless
you have a monitor which can support 100 dpi resolution.
In that case, you may prefer the 100dpi fonts available in
the X11-100dpi-fonts package.
You may also need to install other X11 font packages.
To install the X Window System, you will need to install
the X11 package, the X11 package corresponding to
your video card, the X11R6-contrib package, the Xconfigurator
package and the X11-libs package.
Finally, if you are going to develop applications that run
as X clients, you will also need to install the
libxorg-x11-devel package.